The CData Cmdlets PowerShell Module for Sage 200 supports standard SQL joins like the following examples.

Inner Join

An inner join selects only rows from both tables that match the join condition:

SELECT b.Id, b.Code, c.Id, c.Name FROM Banks b INNER JOIN Currencies c ON b.AccountCurrencyId = c.Id

Left Join

A left join selects all rows in the FROM table and only matching rows in the JOIN table:

 SELECT b.Id, b.Code, c.Id, c.Name FROM Banks b LEFT JOIN Currencies c ON b.AccountCurrencyId = c.Id